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.. e GLOSSARY A posteri ori reasoning based on observations or experi- ence, after observ at i on or experi ence. A priori reasoning based on theory, before observa- tion or experience. Cell the individual unit or cloud in cellular convection. Cloud seeding an organized, convective, fluid motion characteri zed by the presence of di st i nct convection cells or convective units, usually with upward motion in the central portions of the cell, and sinking or down- ward flow in the cell's outer regions. the scientist flying in the right seat of the cloud physics aircraft who helps select the initial seeding line, determines the seedability class of the clouds, and selects the individual cells on which detailed penetrations are conducted. the alteration of the natural development of a cloud by the addition of artificial particles. e Cellular convection Cloud physics scientist Confirmatory experiment a description, in prose or symbols, of how a process of interest functions [e.g., a written narrative (scenario), including the relevant equations of the microphysical process and how treated or nontreated clouds create a chain of events that result in precipitation on the ground]. a formal attempt at 11 independent 1 y" rep 1 i - cating a result (typically a result of a previous experiment) such that it at least has a very high degree of statistical credi bil i ty. Conceptual model Covariate a measurable quantity or variable which can be used to predict what the value of a related variable would have been in the absence of seeding. It must not be affected by seeding. e viii